Abstract
The results of fluorescence experiments carried out on two ethylene−propylene copolymers (EP) labeled with pyrene, naphthalene, or both provide the first experimental evidence of intrachain formation of crystalline microdomains in solution. Differential scanning calorimetry (DSC) experiments performed on 50 g/L EP solutions in toluene demonstrated that one EP copolymer was crystalline (EP-CR) while the other was amorphous (EP-NCR). The intrinsic viscosity of EP-CR and EP-ΝCR in toluene was measured as a function of temperature. EP-CR was the only sample to exhibit a decrease in intrinsic viscosity around 0 °C, suggesting a decrease of the hydrodynamic volume of the polymer coil as expected if EP-CR forms microcrystals in solution. The light scattering intensity of 2 g/L solutions of EP-CR and EP-ΝCR was also measured as a function of temperature. The EP-CR solutions showed an increase in light scattering intensity at temperatures below 0 °C. The same observations were made with the fluorescently labeled E...
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